Calibration problem?

Hi, we have improved the print quality since the first attempt, we have found the printing problem was the ir sensor (slighty crooked), but still have issues with the chimney in the benchy.

In the image attached, the first attempt was in original size, there is excess of plastic in the hull.
The second one, same as the first but 50% of the original size, a bunch of plastic in the hull, bad chimney and plastic shavings.
We have corrected the ir sensor and the result is the third one, have a little imperfection in the hull (without excess of plastic), but still getting shavings and a bad chimney.
The settings are used:
PLA temp 220
Bed temp 60
100 microns
30% infill

I'm far from an expert but will do my best.
As far as I'm aware the IR sensor is purely for homing and levelling the bed so once the print has started it has no job so I wouldn't expect that to cause you any issues higher up on the build other than the first few layers.
If you have reduced the print size by 50% you must watch your nozzle size is suitable. What nozzle size are you using?
What software are you using for slicing? I would maybe post what profile you are using and also some of your settings as people may be able to suggest some changes. I would be concerned with the retraction from those photos and speed of the tool but I reiterate I'm no expert.

Have you calibrated your e-steps to make sure you're extruding the correct amount of filament? Even if you've got the e-steps set, it's worth doing some solid small test cubes to check their dimensions and fine-tune your extrusion rate.

Other than that, some of the drooping could be down to too high nozzle temperature or not enough cooling - what fan speeds are you using? You've also got some stringing which might mean you need to increase retraction (although be careful not to set it too high for a V6 as this can cause jams).

Well, I'm using simplify3d, the nozzle is 0,40, and I can upload the profile I've used, the version of the BigBox is 1.1 we got the pro titan hybrid version stock.
I've done the extrusion calibration, now got 411 in extrusion. The fan speed is 60% and the reatrction is set to 1,50.
Profile uploaded.
Thanks for your answers, we are printing a top mount filament, cause sometimes do not extrude. 200 micron 215 º.
I will post the result.

Well, I'm using simplify3d, the nozzle is 0,40, and I can upload the profile I've used, the version of the BigBox is 1.1 we got the pro titan hybrid version stock.
I've done the extrusion calibration, now got 411 in extrusion. The fan speed is 60% and the reatrction is set to 1,50.
Profile uploaded.
Thanks for your answers, we are printing a top mount filament, cause sometimes do not extrude. 200 micron 215 º.
I will post the result.

Click to expand...

Because of the cooling problems that @PsyVision mentioned, I rotated the model 90 degrees to allow a better air flow. Best to print a new fan shroud from here.

Thanks for your responses, I've been a bit busy and the result of the 200 micron test was a failure, the roll of the filament was not moving.
So I decided to change the sensor mount and the firmware, Alex9779 firmware.
Then did a mesh level, calibrate extrusion steps (now got 418 in 100mm test), calibrate the sensor and improvising a filament roll mount... (I know, is a bit precarious), now i'm printing a temp tower at 60º of bed temp.
Yes @PsyVision, the problem only appears in the front. I need to modify the dual alternative to single extruder.